Analysis of continuous cooling transformation characteristics of 4330-Nb steel for sucker rod

doi:10.13251/j.issn.0254-6051.2023.08.007

Abstract

Abstract: Continuous cooling characteristics of undercooled austenite for 4330-Nb steel for sucker rod were studied by using static CCT curves, microstructure and hardness tests. The results show that the CCT curves of the steel presents three transformation zones independent and unconnected to each other during the continuous cooling process. The high temperature transformation zone is small, which is the result of the comprehensive action of Nb, Cr, Ni, Mn and other alloying elements. With the increase of cooling rate, the change of hardness shows a trend of raising segment to stable segment, which is consistent with the trend of microstructure. The important reason for the formation of banded structure when the cooling rate is less than 0.2 ℃/s is the low cooling rate and the banded segregation of C, Si, Mn, Cr, Ni and other elements. Therefore, in order to obtain a uniform microstructure for the 4330-Nb sucker rod steel, the fast cooling method should be selected during the cooling stage after hot rolling. In production, the quenching and tempering process can be used to obtain excellent performance.

Key words: 4330-Nb steel for sucker rod, CCT curves, hardness, microstructure

CLC Number:

TG142.41

Sun Xiaoran, Wang Chengming, Zhao Nan, Bai Lijuan, Zheng Wenyue. Analysis of continuous cooling transformation characteristics of 4330-Nb steel for sucker rod[J]. Heat Treatment of Metals, 2023, 48(8): 42-46.

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